In the seventh month, in the first day of the month. Only one of the monthly festivals is named in this chapter, because it is the only one on which a holy convocation was to be held. The first day of the seventh month we should expect to be holier than the first day of any other month, on account of the peculiar holiness of the seventh month, and because it was the beginning of the civil year.
It is to be a sabbath; that is, a festival observed by rest, and a memorial of blowing of trumpets. The latter words should be rather rendered a memorial of a joyful noise. That these joyful sounds were made by blowing the cornet, we may well believe from the testimony of tradition, but the text of Holy Scripture does not state the fact, and the use of the word trumpets in place of "cornets" leads to a confusion.
Every new moon, dud among them that of the seventh month, was observed by the blowing of trumpets (Numbers 10:10), but the trumpets then blown differed in their use and shape from the cornet. The trumpet was a long-shaped, metal instrument, at first used to give the signal for marching, afterwards to serve as the sign of the arrival of the monthly festival; the cornet was an animal's horn, or, if not a real horn, an instrument formed in the shape of a horn, and it was used to express joyful emotions, answering somewhat to our modern bell-ringing in the West, or firing unloaded guns in the East.
Besides the blowing of trumpets, special sacrifices were appointed for the first of each month, "two young bullocks, and one ram, seven lambs," with their meat and drink offerings, for a burnt offering, and "one kid of the goats" for a sin offering (Numbers 28:11-15).
On New Year's Day, which, from its difference from the other new moons, was an annual as well as a monthly feast, the special offerings were "one young bullock, one ram, and seven lambs," with their meat and drink offerings for a burnt offering, and "one kid of the goats" for a sin offering; and these were to be in addition to the offerings made on the first day of each month (Numbers 29:2-6).
It became a custom for the Levites to chant at the morning sacrifice Psalms 81:1-16, and at the evening sacrifice Psalms 29:1-11. The great joyfulness of the day is shown by the account given of its observance in the Book of Nehemiah.
It was on the first day of the seventh month that Ezra read the Book of the Law publicly to the people, and when "the people wept, when they heard the words of the Law," Nehemiah and Ezra and the Levites said, "This day is holy unto the Lord your God; mourn not, nor weep … .
Go your way, eat the fat, and drink the sweet, and send portions unto them for whom nothing is prepared: for this day is holy unto our Lord: neither be ye sorry; for the joy of the Lord is your strength.
So the Levites stilled all the people, saying, Hold your peace, for the day is holy; neither be ye grieved. And all the people went their way to eat, and to drink, and to send portions, and to make great mirth, because they had understood the words that were declared unto them" (Nehemiah 8:9-12).